Blast Hole Pattern & Charge

Burden Spacing Powder Factor

$4.99 · Designed for iPad. Not verified for macOS.

5-inch holes in granite on a 30ft bench - burden, spacing, powder factor? Pattern layout, charge per hole, drill footage with flyrock warning. $4.99 one-time, no login. Wrong burden or spacing means flyrock, poor fragmentation, or wasted explosive. This calculator designs safe, efficient blast patterns based on hole diameter, rock type, and bench geometry. Enter hole diameter, depth, bench height, face width, subdrill, stemming, rock hardness (soft to very hard), and pattern type (rectangular, staggered, triangular). Calculates burden, spacing, total holes, rows and holes per row, powder factor, charge per hole, total charge weight, and total drill footage. Rock hardness presets for limestone, shale, sandstone, slate, granite, basalt, and quartzite with industry-standard burden multipliers. Shows powder factor with safety threshold warning. KEY FEATURES: - Three pattern types with layout preview - Powder factor calculation and warning - Subdrill and stemming sizing - Total drill footage estimate - Works completely offline Built for drill and blast engineers, quarry operators, and mining contractors.

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Version 1.2

The developer, Shanghai Sheyuan Network Technology Co., Ltd., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

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    Accessibility

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    Information

    Seller
    Shanghai Sheyuan Network Technology Co., Ltd.
    Size
    1.1 MB
    Category
    Utilities
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • iPad
      Requires iPadOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    English
    Age Rating
    4+
    Copyright
    © 2026 Sheyuan Inc.
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.

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